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源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.com)</title> </head> <body> <p id="demo">单击按钮连接2个字符串形成一个新的字符串。</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ var txt1 = "Hello "; var txt2 = "world!"; var txt3=" Have a nice day!"; var n=txt1.concat(txt2,txt3); document.getElementById("demo").innerHTML=n; } </script> </body> </html>
运行结果
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